Universal cord-circuit.



J. E. HILBISH. UNIVERSAL CORD CIRCUIT.

APPLICATION FILED APBJI, 1914.

1,127,437. Patented Feb. 9, 1915.

Z/Z/Z7z7 E55E5: I fizz/527722": MM GBQ Q QM JUZYHEH'ZZ'JZ'EZZ. mm. 27 7M Application inc- :1 3. 5mi 1'1 'To izii whom it mug; concern.

"130 it known that 1, Joan 1%.. Human, a citiie'nof the United States of America, residiiigat LaiGrangc, county of Cook, and

t5 of' lllinois have invented certs ""alidiisefu'l Improvements in Univcrei relates to univer Qfor-ijconncction magneto or ttery telephone lines and has to a cordciicuitfhaving means for a utomatically adjustingthe supervisory apparatus tofgcoiiioi'in to; magneto or common battery "comedi n-mama with ringing apparatus ant oniatically adjusted for manual or automatic control according to the character of line connected with. "Incertain types ofts ufitohbpards, different lines such as mag ueto and common battery lines terminate bofone a single operators position. and the operators cord circuits inust arranged so that they-may be connected with either ,typeofiline and although cord circuits have providedinrwhich supervisory apparatuses automatically adjust themselves as tmthescharacter of line connected withmny; improvement goes furtherin that sit PrhvideS e-single supervisory signal au' tomaticaillyadjustable, and ringing apparams automaticall adjustable, t according to whether th cord circuit is connected with oneiorttho other character oflinet 85. Another feature resides in the provision ofidlink cirouit which may be connectedto eitlir 'a twdorthree wire common battery "iiasmaia nem line, automatically ad jusfiflngiitsel i so as to properly take care of 40:

cam g=and supervisory apparatus in a 'nnei ias' l ast' outlined. 1

"ingeneral to my maven I htrated in; the) accompany Elia-wing, it comprises a wellhnown of magneto" substation A'tern'iinac 5 in "a simple drop I and jack line itfiIi which? consists of a signal and 3. Td theright of the drawing is a'fe tosubstation B similar fterininating 'in-a line circuit tctlmtof L. A comnioirbattery substatiiiiijjfi also shown terminating use tw battery lino circuit l-ficoinpr 'iiiliniefrelay LR,-cut-ofi relay "si-ga'al' send jack 5% A sic-called Lffsimilar g tic'ularly with the provision of vi -"c r we Silica tin-as a ATELQT V QFFICE.

jsisISHi, or Lat-mantis; trainers, ASSIGNOR 'ro KELLOGG swrronnom AMI; la-132E112 GGMIANY, or carcass, HZiiINQIS, A conromrlou on ILLINOIS.

wait tram lalctters Patent.

Patented Feb. 9, 1915.

Serial No. $31,129.

three-wire line circuit L is also illustrated in part, theline relay (not shown) being similar to that of circuit L A cord circuit D is provided which is of universal character in that connection may he made between two magneto substations such A and B, or between a magneto and common battery substation A and C, or connection may he made to the three wire line circuit L At the answering end of the cord circuit D I provide answering plug P which is connected by the tip and sleeve conductors to a calling plug P through the winding of a repeating coil RC and which has the condensers T and T interposed between the windings of the repeating coil RC. An answering supervisory relay AS 18 provided and is in bridge of the tip and sleeve conductors. The slow acting disconnect relay DM is associated with the answering supervisory relay which is encrgizedby means actuated to eflace the supervisory signal SS when the calling magneto substation has given the disconnect signal, and also for restoring the locking arma ture of the said relay AS. A listening key LK is associated with the answering end, which when actuated, connects the operators set 0 in bridge of the answering tip and sleeve conductors.

Referring now to' the calling end of the cord circuit, switching relays SW and SW are provided, the said relay SV operating in series with cut-oil relay C0 of the common battery line circuit and said relay SW is operated when the said relay SV is ener-,

gized. It will be apparent that both switching relays always operate together, I having employed two separate magnets on account of the number of contact springs. The switching relay SW does not operate when the cord circuit D is connected to a magneto line as the sleeve of the jack of a called magneto line is on open circuit and therefore bridges the" magneto winding M of the calling supervisory relay CS across the cord conductors. The switching relay SW." is operated when the switching relay SW closes an alternate Contact, the switching relay SW closes a normally open contact to cross the ring and sleeve contacts of the calling ductors so as to form a second or sleeve conductor and also forthe purpose of supplying battery current for talking purposes.

The switching" relay SW automatically" ringing. When the switch S is thrown for automatic ringing and when the cord circuit D 1s connected to a magneto line, the relay SWV remains inert by reason of the relay 'SWV not operating, therefore adapting itself automatically. I also provide a calling supervisory relay CS which controls the supervisory signal SS when the link circuit is connected to a common battery line, the supervisory signal SS being. efiaced or lighted, as the casemay be, having its circuit through resistance R to round causing the lamp to glow brightly, %Vhen the link circuit D is connected to a magneto line, the signal SS is used as av disconnect signal only and when the hand generator at the called magneto substation is operated, causing a flow of current through the magneto winding M of relay CS, energizing the rela CS which closes a circuit for the signal S including the common battery winding GB of the supervisory relay CS, which being of a higher resistance than the resistance R causes the signal to light with a dull glow indicating. to the. operator that a disconnect si al has been received from. the magneto su station. When a common (battery substation wishes to recall the operation of the switch-hook, at the called substation, causes the signal SS to flash ,brightly. Now if a magneto substation wishes to recall, the'continned operation of the hand generator causes a flow of currentthrough the winding M of relay CS and this continued operation causes current to be induced into the common battery winding CB of the relay CS and as the winding GB is includedin the signal circuit, this causes the lamp to flicker with a dull glow. This distinct signal for a magneto line notifies the operator of the difference between the disconnect and recall'signal ona magneto line.

I provide a party line ringing apparatus for either automatic ringing control or manual control, either one of these controls being provided by the operation of a switch S. This party line ringing of automatic and manual control is preferably used in ringing common battery lines-only, but I do not wish to be limited to the same .T he switch S can be thrown to connect the interrupter I -to intermittently energize and interrupt relines manually. I provide a four-party ringin key RK associatedwith the generators G Gr and G which may be connected in circuit by independently operable ;op erated when a key pressed and closes -a -1oc ring circuit for itself and upon energization of the relay RD the interrupter relay IR is energized to inter-f mittently connect ringing current to the called line until a response is received from the calledv substation, when the ringing disconnect RD deenergizes opening the circuit of the relay IR, .disconnecting the ringcurrent fromv the line.

At times it is. desirable to use manual ringing as at night when few calls are made and therefore I provide the' switch S, which when throwninto its dotted-position, automatic is used and when in the p0'sition shown manual ringing is used.

Having described in general the apparatus as illustrated, I will now describe the opera;

tion of the circuit when connection is made between the different lines as shown.

' now that; the subscriber atlm'agneto substation A initiates a call, he operates the hand generator at the substation which throws the drop signal S of the line circuit-L and the operator noting the actuated drop inserts the plug P into the jackJ. The operator then throws listening keyLK' to inquire the wants of 4 the calling subscriber, and'in operating the key a momentary circuit is closedfor the relay DM but this momentary energization does not'afiect the apparatus. Assuming now that the subscriber at magneto substation A wishes tl,

converse with the subscriber at common bat- SW of the cord circuit D in series, the cir-- cuit being traced from battery through the winding of the relay SW, sleeve contacts of the plug P and jack J 2 and winding of relay CO to ground, the relay CO operating extends the talking conductors to the called 'of the line circult L and the'switchingv relay line. Upon the energization of switching relay SW, the -circuit is closed for the switching relay SW traced 'from battery 'through the winding of switching relay SV, alternate contact-7 of the relay SW through resistance R to ground. Also upon the closing of the alternate contact 7 of relay S\V, a circuit is closed for the supervisory signal SS traced from battery through the lamp SS normal contact 8 of the" contact 7 of relay lwfjthmi s i"ws s jlli thus hght n th eiqs ipervisory signal SS, said si rial? ainiiigfllighteduntil the calling su jsiiriben answtrs? The closing "of the alterhate cplitact 9"of the switching relay SW prossesbtheirihgfa'nd' sleeve contacts of the slug??? to connect a second or sleeve conuctorso as to'form a two wire cord circuit {or conheting'to a twowire line circuit L *siipplying battery to the line for tallgingf p'urposes. The operator now do peressesftheprop'er party line ringing he) assuming that it is the generator G tliatflfiis'been connected, and when the key is {in fully depressed position the end springs 5 and 6 are moved to their alternate position closing the circuit for the ringing disconnect relay RD traced from battery through winding of relay RD alternate contact'tijalternate contact 10 of relay SW2 normal Contact 8 of relay CS, alternate con-- tact 7 of relay SW through R to ground thus ehergizing relay RI), said relay RD "closingalocking circuit for itself traced frolnbatt'ery through windingiof relay RD, alternate contact 11 of relay D, conductor 12, normal contact 8, alternate contact 7 throughlt to ground. Upon energization of'relayRD, circuit is closed for the interrupfier rela- IR'traced from battery through windingo relay IR, alternate contact 13 of relay RD,-normlil contact 5, alternate contact 14, switch "S (assuming that the switch 5' is thrown for automatic ringing) through the interrupter I to ground. The inter rupter IR'is'intermittentIy energized to connect ringing'curreht to the tip conductor of thecord-circuit D, "th'e tip contacts of the plug P and 'jack J 2 through the condenser and call bell to the called-for substation, of sleeve contacts'of the jack J and plug P", sleeve conductor-ofthe cord circuit D, alternate-contact 16 of relay lit to battery and ground T relay IR is intermittently en ergized to intermittently connect ringing current to the line for ringing the called-for subscriber. v

llVhen the-called-for subscriber answers. an energizing circuit is closed for the calling supervisoryrelay CS traced from battery through the winding of relay Q W conductor 17, altern'rit i'contact 9, of relay Sli the sle'eVcondnbtor, sleeve contacts of plug P and-jack- J through the substation tip conteats-of the jaolrqd and plug P normal contact 15 oirelay IR, alternate contact 13 of relay SW. the conimonbattery winding 'CB 'ofrel'ay' (TS-to ground. this energizes the relay CS-and opens the locking circuit of the ringin'gdisconnect?relav-R17 at normal coir tactrj8., I The relay RD (leenergizing opens itsialtermite contact 13 and interrupts the circuit ofthe relay IR and disconnects the ringing current :from the line. The ener gizati'on of the relay GS also efiaces the supervisory signal SS notifying the operator that the called-for subscriber has answered. The subscriber at the magneto substation A and the subscriber at the common battery substation B are now in conversational circuit, the talking circuit being traced over the heavily marked conductors.

Assuming now that conversation has been completed, the subscriber at magneto substation A. replaces his receiver and operates the hand generator, the current flowing over the line energizin the answering supervisory relay AS. The relay AS attracts its armature'QQ and the spring 19 associated with the armature 2-2 assumes its alternate position closing a circuit for supervisory signal SS traced from battery through the signal SS to ground at alternate contact 19. This lighting of superrisory signal SS notilies the operator that the subscriber at magneto suhstatiin; It has rated his disconnect signal. The repla at of the receiver at the common battery sidjietation C opens the circuit of the calling supervisory relay CS at the switch-hook contacts, the relay CS deenergizing closing its normal contact 8 and again closing the circuit for super visorysignal SS as before traced, lighting the lamp and notifying the operator that the subscriber at C has replaced his receiver. To efi'ace the signal SS at the answering end of the cord circuit the operator now throws her listening key closing an energizing circuit for the disconnect magnet DM traced from battery through the winding of relay DM to ground at alternate contact 20 of the listening key 11K" The disconnect magnet attracts its armatu e the extension 21 of armature 21 lifting upgthe spring 19 releasing the armature 5.2 of her relay AS, the armature returning to nor-: mal by gravity. This opens the circuit for supervisory signal SS at contact 19 efi'acing said signal. The operator now removes plugs P and P from their rcspectivejacks J and J The rexr val of the plug Pdoes not affect other up, rzm s a the answering end of the cord circuit but the removal of the plug l" of jack 5 ope the energizing circuit of the switching rt- SW. the dc cnergization of the sn'in rchn, SW opens the energizing circuit of the switch ing relay SV at altcrrwtr rontact deenergizing the said switching relay SlV. The apparatus of the cord circuit D is now at norn'ial and available for making other connections.

Assuming that the subscriber at the magneto substation A initiates a call. the operation of the hand generator at the substation throws the drop signal S at the line circuit In and the operator noting the drop signal S inserts the answering plug P into the jack J and throws her listening key LK Ill Till

remaining at normal bridges the magneto winding M of the supervisory relay CS as the tip and sleeve conductors of the l circuit D. The switching relay SW aining deenergized does not close an en- 'li-e said relay SlV therefore, remaining at mu-mal. The operator now depresses one of t l: party line ringing keys to manually the called for subscriber at the magal'ion l3. Assuming that it is the generator G, the operator depresses the key plunger to its fully depressed position operating the end springs and 6. Upon the ringi 6 assuming its alternate position, circuit is closed for the ringing disconnect relay RD traced from battery through the winding of relay RD, alternate contact 6, normal contact 10 of relay SW to ground. The energization of relay RD closes an en crgizing circuit for interrupter relay IR traced from battery through the winding of relay IR, alternate contact 13, alternate contact .3, normal contact-'10 of relay SW, to ground. The relay TR- energizing closes its alternate contact 15, connecting ringing current from the generator G to the tip conductor of the cord circuit, the tip contacts of the plug P and jack J the call bell of the called substation, sleeve contacts of'the iack J and plug P, sleeve conductor, altomato contact 16 to battery and ground 3 s naling the called for subscriber at substation B. Each time the operator wishes lo signal. the called-for substation B the key ;.:Iunger is operated to its fully depressed. c-sition to operate the end springs?) and 6 to energize the relays RD and IR. Each de pression oi the ringing key connects ring-- ing current to the called lineuntil the subscriber at substation B has answered. The called subscriber having answered, the two magneto substations are now in conversational circuit, the talking circuit being traced over the heavily marked conductors.

Assuming that conversation has been completed, thesubscriber at the magneto substation A operates his hand generator en ergizing the answering supervisory relay As as before described to light the supervisory s gnal. SS. The subscriber at the magneto substation B operating hishand .rator energizes the magneto wind- CS, to ground.

(sing circuit for swimhing relay SW 'tinn thereof is unnecessary.

ing M of the calling supervisory relay C5, the relay CS energizingrclosing a circuit for supervisory lamp-SS traced firom battery through the lamp-SS, alternate contact 8, normal contact 23, .24 of the listening key LK, normal contact of relay SW, common battery winding GB of rela This lights the lamp S 1 and also closes a locking circuit for the relay CS. The operator now noting the two disconnect signals SS and SS, throws her listening key LK 'to efi'ace the signal SS, the normal contacts 23 and 24 of the listening key LK are opened interrupting the.

attracting its armature 21 to restore the spring 19, which interru ts the circuitof the supervisory signal SC, the said signal SS effacing. The operator now removes the plugs l. and P from their respective jacks, the cord circuit I.) being now available for other connections.

1t connection is to be made to a threewire link circuit such as L plug P is switching apparatus at the calling end of the cord circuit which includes the switchin relay SW and the supervisory relay Cb may be used at the answering end of the cord circuit and in this way providing universal interconnection between any two lines of like or different character. In such case the switching relay would be connected to a third contact of the answering plug P and the magneto winding M connected in normal bridge ;of the talking conductors at the answering 'end without the interposition of any contact but 18. The locking circuit for the winding GB at the answering end would of course include a pair of normally closed contacts as 23, 24 on the listening key. It is believed that such arrangement is so obvious that an illustra- Although in the previous description I have not referred in detail to all possible interconnections. these may be readily traced out and it is to be understood that I do not limit myself to the exact use of my invention as described as I contemplate employing it in other ways and I aim to cover all ring a such changes and modifications as come within the sp rit and scope of the appended:

claims.

Having'described my, invention what 1 claim as new and desire to secure by United States Letters Patent is:

1. universal cord circuit for interconnectm magneto and common battery telephone mes, a common supervisory signal, a

key, ring ng apparatus, and circuit connections'between said key and apparatus whereby automatic or manual control of such apparatus is efiected; according to the character of the line. connected with.

2. -A-telephone' system. comprising a universal cord circuit adapted for interconnecting different types of telephone lines, a common supervisory signal at the calling end of the cord circuit, a ringingkey, automatic andmanual ringing apparatus, said key when actuated being adapted. to efi'ect manual or automatic ringing control according to the type of line connectedwith.

3. A telephone system comprising a universal cord circuit adapted for interconnect- 'mg magneto and common battery telephone lines, a common supervisory signal at the calling and Jot the cord circuit, a ringing key, automatic and manual ringing apparatus, said key; when actuated being adapted to .eifect the association of either the manual or automatic ringing control with the cord circu it according to whether the line connected with is commonbattery or magneto respectively. a a

4. A. telephone system comprising magnetoandcomm'on battery lines, an operators circuit having a connecting terminal for connection with said lines, supervisoryapparatus including a common signal. differe'nt-ly operable'according to the character of line connected with, a ringing key, ringing apparatus, and circuitconnections between said key and apparatus whereby automatic or manual control of such apparatus is effected according to the character of the line connected with.

5. A telephone battery-lines, an operators .mon battery lines,

system comprising mag-' link circuit having a connecting terminal for connection with said lines, supervisor apparatus including a common si'gnal ifierently operable according to the character of line connected with, a ringing key, ringing apparatus, and circuit connections whereby when said terminal is connected with a magneto line manual control of said ringing apparatus by said ke'y is'efiected and whereby when a common battery line is connected with automatic control of the ringing ap- A paratus is effected.

6. A telephone 'system comprising magneto and common battery telephone lines, two conductor jacks for said common battery lines, a universal cord circuit having a connecting terminal for connection with any of said lines, supervisory apparatus, a ringing key, ringing apparatus, circuit connections whereby when said terminal is connected with a magneto line manual control of said ringing apparatus by said key is effected and whereby when a common battery line is connected with automatic control of the ringing apparatus is effected.

7. A telephone system comprising magneto and common battery telephone lines, twoand three conductor jacks for said coma universal cord circuit having a connecting terminal for connection with any of said lines, supervisory apparatus including a common signal differently operable according to the character of line connected with, a ringing key, ringing apparatus, circuit connections whereby when said terminal is connected with a magneto line manual control of, said ringing apparatus by said key is efi'ected and whereby when either type of jack of a common battery lme is connected with automatic control of the ringing apparatus is efi'ected.

Signed by me at Chicago, county of Cook and State of-Illinois, in the presence of two witnesses;

Gnoaon E. M. R. Rocnrono. 

